Artificial tooth



(No Mbdel.)

I ROBBINS. 2d.

- ARTIFICIAL TOOTH.

No. 279,187. Patented June 12,1883.

' a um UNITE STATES PATENT Omar.

NATHANIEL ROBBINS, 21), or WEST HARWlCH, MAssAoHnsETTs.

ARTIFICIAL TOOTH.

S'BEGIFICATION forming part of Letters Patent No. 279,187, dated June 12; 1883.

Application filed May 2, 1883.

T all whom it may concern ,Be it known that I, NATHANIEL RoBBi s,

. 2d, a citizen of the United States, residing at West Harwich, in the county of Barnstable and State of Massachusetts, have invented a new and useful Improvement in Artificial Teeth, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to artificial teeth of that class which are secured to their plates without the use of pins; and its object is to provide teeth of this kind possessing superior advantages in point of simplicity, inexpensiveness, durability, and general efficiency.

Heretofore in many of this class of artificial teeth the blocks have been provided with a complicated arrangement of chambers and recesses in their rear and top walls, and the material of which the plate is composedis molded in these chambers; but this arrangement of recesses and chambers necessitates making the block of teeth very thick, and they will then set out from the plate. These disadvantages are obviated in my invention, in which the whole top and back wall. of the block of teeth is cut away and openings made in side walls, and I am enabled to set the blocks of teeth very close to the plate an d fit them snugly thereto, and they can also be more easily and readily molded.

In the drawings, Figure 1 is arear perspective view of a block of teeth constructed according to my invention. Fig. 2isa like view of the block before it is provided with the longitudinal groove. Fig. 3 is a transverse sectional view of the block when completed and ready to be applied to the plate. Fig. 4. is a longitudinal sectional view of the same, taken through the groove. Fig. 5 is a perspective view of the mold for forming these improved teeth thrown open. Fig. 6 is asectional view of the mold closed.

Referring to the drawings, A designates a block of artificial teeth,having its face B formed after the usual manner and withthe desired number of teeth. The top and back walls of this block are entirely cut away (or the block is molded in this form) to provide an open chamber or recess, 0, that extends longitudinally and has no back wall, but is entirely open, as shown, so that the said block can be set close to the plate. This open recess has afrontwall,

(No model.)

D, formed by the upright face of the block,

and bottom wall, E, extending longitudinally,

and end walls, F F, formed by rests or partitions G G, that project rearwardly from the front wall, D, to the rear edge of the block. After the block is thus formed with the longitudinal open recess having the front, bottom, and end walls, a groove, H, is formed in the bottom wall, E, at its point of juncture with the front wall, D. This groove extends the entire length of the block and passes through the rests or partitions G G, forming perforations I I through the said partitions or rests. The latter preferably have their top edges beveled off downwardly and inwardly, as shown at J. The mold K,fo r forming these improved blocks of artificial teeth, comprises two sec-.

tions, L M, respectively, which conform inter'iorly to the shape of the block before the groove is formed, as shown in Fig. 2 of the drawings. The section L of this mold is provided with a peribration, N,through which a formingrod, 0, can be passed when the two sections of the mold are together, and the block is molded into the form shown in Fig. 2 to form the longitudinal groove, this perforation being arranged to guide the forming-rod through the block of teeth at the desired place. Other means may be employed for forming these improved blocks of teeth; but the mold herein shown is preferred.

The operation and advantages of my invention are obvious. These blocks are very simple and easily formed, and are especially useful and efficient for the purpose for which they are designed. The material of which the plate is composed is easily molded into the open recess and into the simple longitudinal groove.

I claim as my invention- 1. A block of artificial teeth adapted to be attached to the plate without pins, the same having its top and rear walls cut away (or molded in this form) to provide an open chamber or recess extending longitudinally, and having an entirely-open top and back, so that it has but a front, bottom, and end walls, as set forth.

2. A block of artificial teeth adapted to be attached to the plate without pins, the same having the rectangular opening with straight sides formed in its top and rear walls, and having the longitudinally-extending front andbottom walls, the rest or partitions projecting rearwardly from the front wall of the recess to In testimony that I claim the foregoing as 16 the rear edge of the block, and forming the end my own I have hereto affixed my signature inv walls of the recess, and the longitudinal groove presence of two Witnesses.

extending the entire length of the block, and formed in the bottom wall of the recess at or NATHANIEL ROBBINS, 2D. near its point of 'u11ctu1.'e with the front wall,

the said groove also passing through the rests Vitnesses:

or partitionsand formingperforationsthrough SAMUEL S. BAKER,

the same, as set forth. JULIA' A. BAKER. 

